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A reverse slipping strategy for bulk-reduced TiO2-x preparation from Magneli phase Ti4O7
Huang, JT; Che, XL; Xu, JJ; Zhao, W; Xu, FF; Huang, FQ
2020-01-07
Source PublicationINORGANIC CHEMISTRY FRONTIERS
ISSN2052-1553
Issue1Pages:212
SubtypeArticle
AbstractBlack TiO2-x is an attractive material due to its adjustable band structure, useful in different applications, and has been heavily investigated and developed. The current reduction of TiO2 involves a process from surface to center: thus, the issue of either insufficient or excessive reduction seems inevitable. To the best of our knowledge, it is rarely reported that a homogeneous defect distribution can be facilely achieved inside black TiO2-x. In this study, a bulk-reduced rutile TiO2-x was obtained via a circuitous two-step approach, with an intermediate Magneli phase (TinO2n-1). With the decomposition of a solid atmosphere creator (e.g. KClO4 grains) at a high temperature, the missing oxygen ions in Ti4O7 could be replenished quantitatively. The TEM and SAED results reveal that the oxidation process is not just a surface reaction, but it involves reverse displacement or structural rearrangement inside the crystal. In particular, the periodic variation of crystallographic sheer planes was the direct evidence of the above bulk reaction, i.e. unified long period for Ti4O7 and varied long period for critical ratio sample. The as-prepared samples showed different band gaps and colors, based on their oxygen content. KClO4, with a critical mixing ratio of around 17.5 mol%, could almost oxidize Ti4O7 to black rutile TiO2-x. Furthermore, the sample formed at the critical ratio showed a considerable photo-thermal response speed of 1.7 degrees C s(-1) and an equilibrium temperature of up to 70 degrees C under irradiation with light above 400 nm, which can be an evidence for the enhancement of non-intrinsic absorption. In short, this study provides a new route for the controllable preparation of black TiO2-x, and a possibility for further development of other solid atmosphere creators.
DOI10.1039/c9qi01042d
WOS KeywordTITANIUM-DIOXIDE ; BLACK TITANIA ; PHOTOCATALYTIC HYDROGEN ; SOLAR ABSORPTION ; NANOTUBE ARRAYS ; WATER ; PHOTOOXIDATION ; SEMICONDUCTOR ; LOCALIZATION ; ENERGY
Language英语
WOS Research AreaChemistry
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/28385
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Huang, JT,Che, XL,Xu, JJ,et al. A reverse slipping strategy for bulk-reduced TiO2-x preparation from Magneli phase Ti4O7[J]. INORGANIC CHEMISTRY FRONTIERS,2020(1):212.
APA Huang, JT,Che, XL,Xu, JJ,Zhao, W,Xu, FF,&Huang, FQ.(2020).A reverse slipping strategy for bulk-reduced TiO2-x preparation from Magneli phase Ti4O7.INORGANIC CHEMISTRY FRONTIERS(1),212.
MLA Huang, JT,et al."A reverse slipping strategy for bulk-reduced TiO2-x preparation from Magneli phase Ti4O7".INORGANIC CHEMISTRY FRONTIERS .1(2020):212.
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